Ion-exchange synthesis and improved Li insertion property of lithiated H₂Ti₁₂O₂₅ as a negative electrode material for lithium-ion batteries

Peer review under responsibility of The Ceramic Society of Japan and the Korean Ceramic Society.

Abstract

We successfully prepared the lithiated H₂Ti₁₂O₂₅ sample by the H⁺/Li⁺ ion exchange synthetic technique in the molten LiNO₃ at 270 °C using H₂Ti₁₂O₂₅ as a starting compound. Chemical composition of the obtained lithiated H₂Ti₁₂O₂₅ sample was determined to be H_1.05Li_0.35Ti₁₂O_25-δ having δ = 0.3 by ICP-AES and DTA-TG analyses. The H⁺/Li⁺ ion exchange was also confirmed by powder XRD, ¹H-MAS NMR, and ⁷Li-MAS NMR measurements. Electrochemical Li insertion and extraction measurements revealed that the initial coulombic efficiency was improved from 88% in H₂Ti₁₂O₂₅ to 93% in the lithiated H₂Ti₁₂O₂₅ sample. In addition, superior capacity retention properties for the charge and discharge cycling performance and good charge rate capability of the present lithiated H₂Ti₁₂O₂₅ were confirmed in the electrochemical measurements. Accordingly, the lithiated H₂Ti₁₂O₂₅ is suggested to be one of the promising high-voltage and high-capacity oxide negative electrodes in advanced lithium-ion batteries.

Keywords:

• Lithium battery
• Anode materials
• Ion exchange

Acknowledgment

We express our gratitude to Dr. Y. Sakiyama of Toray Research Center for her experimental help and discussions regarding the ¹H-MAS NMR and ⁷Li-MAS NMR measurements.

Notes

Peer review under responsibility of The Ceramic Society of Japan and the Korean Ceramic Society.